Your website has been balcklisted by Google Safe browsing. It is integrated in Firefox, Safari, and Chrome (not Internet Explorer).
First check what Google Safe Browsing says about your domain on the diagnostic page:
Malicious software is hosted on 1 domain(s), including addonrock.ru/
So, somewhere, you have a link to this domain. Indeed, on all your pages, you'll find this at the end of the code, after the </html> tag:
You're web application has been hacked! If you are using an open-source application, check if you are running the latest version (check the plugins as well). There may be a known vulnerability.
Here is what to do next:
- understand how your site was hacked: known vulnerability in application, problem with your hosting provider, vulnerability in your code (remote file inclusion, etc.), etc.
- plug the hole: upgrade your application, fix your own code, etc.
- check all your files and databases for any malicious code
- restore a safe backup
Step 4 is OK if you are sure that the attackers has not left any backdoor. Of course, you can never be 100% sure.... If you have enough time and money, use a new server to host your website.